These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Russia pledges not to stand in the way of Paris climate deal. Russiaâs president Vladimir Putin delivers his speech at the COP21 conference in Le Bourget, Paris. Russia has pledged not to stand in the way of a deal at the Paris climate change conference, removing another obstacle to a potential agreement, the Guardian has learned.